Be explicit about namespace testing to not mix it with blink::testing

third_party/WebKit/Source/platform/bindings/RuntimeCallStatsTest.cpp

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/bindings/RuntimeCallStats.h"
 
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/wtf/CurrentTime.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
 namespace {
 
 TimeTicks ticks_;
 
 void AdvanceClock(int milliseconds) {
   ticks_ += TimeDelta::FromMilliseconds(milliseconds);
 }
 
 RuntimeCallStats::CounterId test_counter_1_id =
     RuntimeCallStats::CounterId::kTestCounter1;
 RuntimeCallStats::CounterId test_counter_2_id =
     RuntimeCallStats::CounterId::kTestCounter2;
 
 }  // namespace
 
-class RuntimeCallStatsTest : public testing::Test {
+class RuntimeCallStatsTest : public ::testing::Test {
  public:
   void SetUp() override {
     // Add one millisecond because RuntimeCallTimer uses |start_ticks_| =
     // TimeTicks() to represent that the timer is not running.
     ticks_ = WTF::TimeTicks() + TimeDelta::FromMilliseconds(1);
     original_time_function_ =
         SetTimeFunctionsForTesting([] { return ticks_.InSeconds(); });
   }
 
   void TearDown() override {
@@ skipping 280 matching lines @@
     RUNTIME_CALL_TIMER_SCOPE_WITH_OPTIONAL_RCS(scope, &stats,
                                                test_counter_1_id);
     AdvanceClock(25);
   }
 
   EXPECT_EQ(1ul, counter->GetCount());
   EXPECT_EQ(25, counter->GetTime().InMilliseconds());
 }
 
 }  // namespace blink